Freenom, as the only free domain registrar in the world, offers free registrations for domain suffixes like .tk .ml .ga .cf .gq. However, these types of domains have been blacklisted by some service providers and are not recommended for use as primary domain names—best just for experimentation.

Official Website

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A Name for Everyone
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Domain Registration Failed Due to Technical Error

Some of your domains could not be registered due to technical errors. The mounsea.ml domain has been canceled.

Note that the IP address should correspond to the country of registration, and a virtual phone number from the respective country can be optionally used.

Trying again should lead to successful registration.

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Domains can be Manually Renewed Before Expiry

Freenom Domain Automatic Renewal

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freenom域名自动续期
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Free Domains May Be Revoked

I haven’t encountered this issue yet, but if it happens, I will post a proof image.